Sound-box for talking-machines.



B. L. RINEHART. SOUND BOX FOR TALKING- MACHINES.

APPLICATION FILED D30. 22, 1905.

Patnted Aug'.26,1913.

INVENTOR 'Lfiuw/za/ffi ATTORNEY.

WITNESSES NT onnicn.

BENTLEY In RINEHART, QB Gilli-DEN, IJEWl JERSEY, A$SIG NOE VICTOR TALKING- GHIME GQMPANY, A. CORHOMTION OF NEW JERSEY.

SU-B GX' IEUE TALKING-MACHINES.

tlpcoification of letters E'atent.

Patented Aug. 26,191 3.

Appiioationsfllefi December 22, 1905. Serial No. 292,919.

following is' a fail; clear, and exact do.

sorition.

ll invention relates to certain improve ments-insound boxes for talking machines, and articul'arly to the yielding support on I whic the stylus bar is mounted.

which the spring-support for the stylus baris subjected.

Briefly, my invention consists in mounting the stylus bar 11' on a spring support, the axis of which is disposed at right angles to the plane of the diaphragm, and coincident Wlbli the plane of oscillation of the stylus bar, said spring bein mounted upon the-free ends of a bow provided with means for varying the distance between the free ends'oi-said bow, and consequently the tension to which the spring is subjected.

In the accompanying drawings, forming a part of this specification, Figure 1 is an elevational View of a sound box provided with my invention, the lower portion oi said box being shown in section Fig. is plan view of the lower part of the sound box,- showing the spring support mounted thereon; Fig; 3 is a longitudinal section. of-

san'ae; and Figs. 4: and 5 are enlarged views of the details of my stylus bar and support therefor.

The sound box 1 comprises a diaphragm 2 and a stylus bar 3', which passes through an opening 3" in tl'ie under side of the-sound boa: casing, and; at its inner end, is attached to the center of the diaphragm through the connection 42. I Y i lothe inner side of the sound box with its free ends-in alinement with the opening 3 is mounted the bow or U sha ed spring 5, carrying a block or support 6 y which said bow is attached to the sound box by the screw 7 passing through the said block and" lli'l'iZG iJllG' casing. On the opposite side ofthe opening 3 IS a second block or support 8' carrying a threaded lug or projection 9 and secured to the sound box casingby means of screws 10-1G.

The outer ends of the bow are provided with transverse holes 11-1l adapted to be engaged by the pointed ends of the spindle 12- arranged between the outer ends ofsaid' bow. This spindle 12 is composed of two members, the largerof which 13 is tubular for the greater portion of its len 11 and is providcdon the outside and insi e thereof with threads-13 and 13-" respectively. The other and smaller member 14; is provided with external threads 14 and is adapted to 1' member 13in" ig. 4. The outer be secured within the lar the manner indicated in ends of the members 1314 are provided with collars 15-15 having spannefholes 15-, by which the effective lengtli of the spindle 12 may be varied. The member 13 is screwed into the threaded lug 9 of theblock or support 8-, while said member a jam nut 16 is provided to hold the block 8 firmly in its position with respect tosaid member 18, and siniilai'ly'upon the member lis'another locl'r nut 17, adapted to engage the end of the member" 13 to prevent any relative movement ofsa-id members when t ey are intheir adjusted position.

The spring 18, upon which the stylusbarv 3 is mounted, is composed of any suitable;

material of any form in cross sectionig' In the formof' my invention illustrated iii the drawing the spring 18 is of steel wire, and is formed by assing the wire through an opening or -ol then drawing the ends thereof again through said, opening in opposite directions to form a loo on each s1 eof the stylus bar, the ends be I suitable manner, ash-y wrapping OIftWlSlF ing them about the st lus bar in the manner in cated' at 20, and t on soldering the same c 19 in the stylusbar, and

ing secured to the stylus bar in any.'

in such position. The ends of the bow 5 are adapted to be passed through the loops of the spring,'which are retained in a predetermined position upon the how by notches 21 near the ends thereof.

It 'will be seen from the above disclosure,

that, when the tension of the spring wire support 18 is varied by a simultaneous adjustment of the nuts 15 on the outer ends of the spindle 13-14, the position of the axis of the stylus bar will not be changed, and that even when the tension of the said wire spring mounting is varied by turning one of the nuts wit out turning the other, the tension of the spring does not of itself tend to move the stylus bar about its axis of oscillation, except in so far as the lateral displacement of the axis of oscillation causes a rela} tively slight movement of turning of the stylus bar about its other end; that is to say, the end of the stylus bar which is attached to the diaphragm.

A sound box provided with my spring support for the stylus bar ma be assembled in the following manner he bow 5 is first screwed to the side of the sound box by the screws 7 passing through the block or support 6. The stylus bar is then inserted through the hole 3 in the casing, and the loops of the spring 18 passed over the ends of the bow and into engagement with the notches 21 provided thereon. The spindle 12 carrying the block 8 is then placed between t e ends of the harp with its pointed ends in engagement with the holes 11 and the block 8 secured to the casing by screws 10'10. The proper tension is then placed upon the spring 18 by turning the members 13-14, by means ofa key or spanner inserted in the spanner-holes 15 in the-shoulders'l5, to spring the ends of the bow apart Patent, is 55,

loosening and after the proper tension has been applied, the jam nuts 16 and 17 are turned tohold the members in' their adjusted positions'l The inner end of the stylus bar is then secured to the connection 4 in an suitable manner. Further adjustment of t e tension on the spring 18-,may be obtained by simply the jam nuts 16 and 17 and turning the members 13-14 to" vary the length of the spindle. 1 1

Having thus described my invention what I claim and desire to protect by Letters 1. In a sound box for talking machines, the combination with a stylus bar and a spring on which said stylus bar is mounted, the longitudinal axis of said spring lying within the plane of oscillation "of the stylus bar, a bow carrying said sprin and means comprising an axially extensib e spindle to spring the ends of said w apart to vary.

the tension towhich sai jected.

spring is sub- 2. In a sound box for talh'ng machines,

the combination with a casing and a bowshaped support mounted on said casing, of a stylus bar, a spring on which said stylus bar is mounted, the outermost portions of said spring being secured to the arms of said support, and means for adjusting the distance between the ends of said howshaped support, comprising a spindle adjustable with respect to said casing and having relatively movable members respectively engaged with the opposite arms of said bow-shaped support.

3. In a sound box for talking machines, the combination with a stylus bar, of a spring on which said stylus bar is mounted, and means to vary the tension of said spring; said means comprising a spindle of variabl length.

4;. In a the combination with a st lus bar, of a spring onwhich said stylus ar is mounted, and a spindle of variable length for varying the tension of said spring, said spindle being composed of two telescoping members and means for adjusting said members.

5. In a sound box for talking machines, the combination with a stylus bar, of a spring on which said stylus bar is mounted, a resilient bow-carrying said spring, and means to vary the distance between the ends of said bow to apply tension to said spring, said means consisting of a spindle of variable len h mounted upon the sound box and having its ends journaled in the ends of said bow.

6. In a sound box for talking machines, the combination with a stylus bar, of a spring on which said stylus bar is mounted, and means to vary the tension of said spring without tending to distort said bar from its normal position, the longitudinal axis of said springlying within the plane of oscillation of said stylus bar.

7. In asound box for talking machines, the combination witha diaphragm, of a stylus bar, a spring on which said stylus bar is mounted, and means to vary thetension of said spring, said spring having its longitudinal axis at an angle with res set to said diaphragm and being arrang to maintain said stylus bar in its normal position irrespective of the tension of said spring. I 4 8. n a sound box for talking machines,

the combination with a diaphragm, of a stylus bar, a spring carrier for said stylus bar, and means to vary'the tension of said spring carrier, said spring carrier being arranged position irrespective of its tension.

"to maintain said stylus bar in its normal 9. In a sound box for talking-machines,

the combination with a stylus bar and a spring onwhich said stylus bar is mounted,

of a resilient U shaped member to the arms of which the outermost portions of said spring are secured, and means for varying my hand this nineteenth day of December, the distance between theends of the arms of A. D. 1905. said members, comprising a. spindle inter- BENTLEY L. RINEHART. posed between said ends and having thread- Witnesses: 5 ed. portions relatively movable axially. WM. EARLY,

In witness whereof I have hereunto set- CHAs. K. BENNn'rn- 

